# Relationship history for MSHA mine 1508924

Current hierarchy: **Gibby G W & Charles Willingham → G & W Coal Company → No 1 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** G & W Coal Company → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gibby G W & Charles Willingham → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibby G W & Charles Willingham → G & W Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history